[Elecraft] K3 doesn't work in AFSK-A mode but DATA-A does work. What's broken?

[Nr4c]

Are you using software such as n1mm+ to send the RTTY?  If so check to verify it isn’t changing the DATA/AFSK to DATA/FSK D? 

Sent from my iPhone
...nr4c. bill


> On Mar 20, 2020, at 8:42 AM, Joe N9OK <n9ok at myjdk.com> wrote:
> 
> I've reached out to Elecraft Tech Support on this issue. With their locale
> on lockdown, I think they have their hands full just trying to maintain
> some sense of normalcy. So I'm hoping someone here can point me in the
> right direction.
> 
> I've recently upgraded my K3 with numerous "last time buy" options (KAT3A
> antenna tuner, 2 KSUN3A synthesizers, and KIO3B usb board). One goal was to
> remove the Microkeyer II and simplifying the setup.
> 
> What I'm finding now is that I can't make RTTY work correctly. I use MMTTY
> to generate a simple warble signal, which is sent to my K3. The K3 is set
> to AFSK-A, VOX enable, audio levels set correctly. What happens is that the
> K3 TX LED illuminates, but nothing is heard with the Monitor (ie, thru the
> K3 speaker), and there is no RF transmitted. However, when I use DATA-A, I
> do hear tones using Monitor, and there is RF power.
> 
> I get the same results using either the K3 internal sound card, or
> externally-generated audio (fed from my PC soundcard to Line-In on the K3).
> 
> Hoping there was a configuration issue, I factory reset my K3. That didn't
> help.
> 
> It's probable this issue has been there since I first purchased my K3 new 8
> years ago, but I never noticed. My MKII was used as my interface, and I was
> running FSK for RTTY. I did have many configuration issues with my MKII
> setup, which in retrospect might well be related to the AFSK issue that's
> now obvious.
> 
> I'm suspecting this is a hardware issue. I have the 59 pages of schematics,
> and am going thru them to see if I can identify the issue so I can fix it.
> I would appreciate comments / suggestions / ideas to point me in the right
> direction.
> 
> 73, Joe N9OK
> 
> 73, Joe N9OK
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